San Antonio Spurs center Tim Duncan (right) goes up against Oklahoma City Thunder forward Kendrick Perkins during the second half of Game 4 of the Western Conference finals on Saturday in Oklahoma City. The Thunder won 109-103. Larry W. Smith / Associated Press

Durant scored 18 of his 36 points in a scintillating final seven minutes, Serge Ibaka added a career-high 26 points and the Oklahoma City Thunder evened the Western Conference finals at two games apiece by beating San Antonio 109-103 on Saturday night.

After seeing his team's 15-point lead dwindle to four, Durant took over midway through the fourth quarter by scoring all 16 of the Thunder's points during a span of just more than five minutes to keep the Spurs at bay.

"We tried to do a couple of different things but his play was better than anything we did defensively, that's for sure," Spurs coach Gregg Popovich said. "He finished it off in fine fashion."

With All-Star teammate Russell Westbrook limited to seven points, Durant did almost all of the damage late to send the series back to San Antonio all square for Game 5 on Monday night.

Durant, who finished behind only LeBron James in MVP voting, hit three straight jumpers, the last one coming after he bumped into Tony Parker in the lane to draw a foul and set up a three-point play. Then he attacked the rim for his next three baskets, getting to the line again when he was fouled on a layup off of James Harden's alley-oop.

"He just got going. Once a player of that much talent starts scoring, it's hard to stop them," said Stephen Jackson, who was repeatedly bumped off by screens while trying to stick with Durant during his hot stretch.

"He got into a nice rhythm. I was able to stop him one time, but they got the lob and the and-one. He was just rolling. It was kind of too late to stop him."

Durant hit another jumper after coming off a Westbrook screen for the last basket in his personal run - and the Spurs were still within striking distance. Rookie Kawhi Leonard bracketed a pair of 3-pointers around that Durant jumper, and the Spurs were only down 102-96 with 1:24 left.

The Spurs succeeded in getting the ball out of Durant's hands on the next possession, only for him to provide the assist on Harden's 3-pointer from the left wing that bumped the lead to nine.

Durant hit two free throws in the final minute to help close it out.

"I didn't tell myself that I need to go score because what we were doing was working," Durant said.

"We were passing the ball and guys were making shots ... I just wanted to stick with what we were doing, but it started to open up for me and I could see some lanes that gave me some opportunities to make some shots."

Oklahoma City is trying to become the 15th team in NBA history to overcome an 0-2 deficit in a seven-game series, and the eighth to do it since 2004. The Thunder avoided an even trickier task by winning.

Only eight teams have ever overcome a 3-1 hole, and only two had done it while needing two wins on the road - the 1995 Rockets and 1968 Celtics.

"They did what they had to do. They protected their home court here," said Tim Duncan, who led San Antonio with 21 points. "We're going to try to go home and do exactly the same."

Leonard added 17 points and nine rebounds for San Antonio, which had won 20 in a row before losing Game 3.

The Spurs wiped away most of a 15-point deficit with a run that coincided with Popovich turning to DeJuan Blair, who's had some notoriously big games against the Thunder but had occupied a spot on the bench for most of the playoffs after starting 62 of the 66 regular-season games.